AIR POLLUTION
CONTROL DISTRICT

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Old Advisory Events

The information herein is NOT intended for use as a weather forecast. The Air District DOES NOT forecast but solely compiles information from both the Phoenix and San Diego National Weather Offices to relay information concerning potential changes in ambient air concentrations that may impact the public.

August 17 2016
Be Advised
High wind levels have the potential to suspend particulate matter into the air. High levels of PM10 may pose an impact to public health. It is recommended that active children and adults, and people with respiratory disease, such as asthma, limit their outdoor activities.

Potential increases in PM10 concentrations may increase to moderate or unhealthy level.

Imperial County Weather Synopsis
SYNOPSIS FROM THE SAN DIEGO OFFICE
Very warm again today followed by gradual cooling Thursday through the weekend as a weak trough settles over the Southwest. The marine layer will slowly deepen through the weekend. A minor surge of monsoonal moisture will trigger isolated afternoon thunderstorms over the mountains, but the chances are pretty slim

Gradients will bring gusty winds along the mountain passes and the desert slopes again during the afternoon and evenings today and again Friday. Gusty south to southwest winds of 30 to 45 mph will be possible during these times.

SYNOPSIS FROM THE PHOENIX OFFICE
Very warm conditions today will gradually trend cooler through the end of the week, but highs should still stay at or above seasonal normals. Modest monsoon moisture levels look to persist through the weekend with good chances of daily high terrain storms and slight chances across the deserts. The main threat with these storms will be gusty downdraft winds and patchy blowing dust over the deserts

A fairly significant shift in model guidance points toward a more active storm environment this weekend. Model consensus shows the upper level trough off the Southwest U.S. coast on Thursday slowly drifting eastward into southern California sometime this weekend. This will promote a more moist southerly flow keeping moisture levels high enough for storms over the lower deserts. Abnormally cold temperatures aloft will remain over the Desert Southwest while weak dynamics associated with the upper level low should promote at least isolated to scattered storm activity. Have increased PoPs a good amount for Saturday and Sunday because of this model shift. This pattern may last into early next week, but model spread increases quite a bit. Will keep at least broad brushed slight chance to chance PoPs for next Monday and Tuesday
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